point to point tunnel

There are several approaches you can take to this.  One would be a dedicated T1 from site to site. This is fairly effective and costs are "reasonable"  If you don't have huge data needs you could look into using local DSL or Cable connectivity to get to the Internet and establish a VPN.  The downside to this is dealing with local phone or cable companies. Depending on your internal set up you might be able to run a T1 connection without having to have a VPN in place as it's a dedicated line. You don't have to use hardware-based VPN connectivity as Windows and Mac have it built-in, but I find that using Cisco hardware devices at each end makes for an always on VPN connection that in effect puts your remote office on your local office and is very stable.

If you have bigger data needs you might also look into a multi-MB WAN connection if your provider can supply one.  We use such a connection from TWTC between sites and it works very well.  You might also look into the WAN connection instead of the T1 just in terms of pricing.  Sometimes these newer connections are less expensive than the older T1 technology.

We have 20-30 sites that are remote to our main location and we have used both the WAN connection (replaced T1) and DSL/Cable connections.  We use WAN for larger sites and DSL/Cable for smaller ones.  WAN connections come right into switches at our site and run as a separate IP segment...this is a direct connect for us and no VPN needed...it's an extension of our primary network.  All smaller sites use the cisco hardware to hardware VPN setup and unless the phone/cable company has an issue it works really well.

Do know of any links for a detail WAN setup? Our problem is the Cali office connects to the main office in Colorado using a web interface. We have a Sonicwall SSL device. Once they establish the connection then the click the link for the terminal server. It runs slow and they are kicked off constantly. I think it might be running slow because the company uses a NAS device using sata drives for file sharing. I don't think NAS is designed for constant network use.